package com.example.experiment05;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import android.app.Activity;
import android.content.SharedPreferences;



public class MainActivity extends AppCompatActivity {

    Button button;

    SharedPreferences preferences;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        preferences=getSharedPreferences("count", Context.MODE_PRIVATE);
        //读取SharedPreferences里的count数据
        int count=preferences.getInt("count",0);
        //显示程序以前使用的次数
        Toast.makeText(this,"程序以前被使用了"+count+"次。",Toast.LENGTH_LONG).show();
        SharedPreferences.Editor editor=preferences.edit();
        //存入数据
        editor.putInt("count",++count);
        //提交修改
        editor.apply();




        button=findViewById(R.id.btn);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i=new Intent(MainActivity.this,Main2Activity.class);
                startActivity(i);
            }
        });


    }
}
